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Finding the Fourth Proportional to 1,379,938.74, 1,904,315.52 and 768,078.37

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Solution

The fourth proportional to 1,379,938.74, 1,904,315.52 and 768,078.37 is: 1,059,948.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,379,938.74 : 1,904,315.52 = 768,078.37 : x
  2. Step 2: Convert to fraction form
    1,379,938.74/1,904,315.52 = 768,078.37/x
  3. Step 3: Cross multiply
    1,379,938.74x = 1,904,315.52 × 768,078.37
  4. Step 4: Simplify right side
    1,379,938.74x = 1,462,663,551,045.73
  5. Step 5: Solve for x
    x = 1,462,663,551,045.73/1,379,938.74
  6. Step 6: Final answer
    x = 1,059,948.18

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.